boggs and archibald cameron



(No Model.)

J. W. BOGGS '8a A. CAMERON.

DRY DOCK. No. 566,734. Patented Sept.1 1896.

UNITED STATES PATENT rmcn.

JOHN W'. BOGGS AND ARCHIBALD CAMERON, OF PORTLAND, OREGON; SAID BOGGSASSIGNOR TO SAID CAMERON.

DRY-DOCK.

SPECIFICATION forming part of Letters Patent No. 566,734, datedSeptember 1, 1896.

Application led February 21, 1895. Serial No. 539,243. (No model.)

To all whom it may concern.-

Be it known that we, JOHN lV. BOGGS and ARCHIBALD Cmmnoiv, of Portland,in the county of Multnomah and State of Oregon, have invented a new andImproved Dry-Dock, of which the following is a full, clear, and exactdescription.

The object of the invention is to provide a new and improved dry-dockwhich is comparatively simple and durable in construction and arrangedto readily move a ship into or out of the dock, at the same timepermitting light-dra`t vessels in the dock-chamber after the main vesselis docked.

The invention consists principally of a dock-chamber having at one end asliding gate for opening and closing the inlet to the chamber, thelatter being connected at its rear end with the dry-dock proper' locatedat a higher level.

The invention also consists in certain parts and details andcombinations of the same, as will be hereinafter more fully described,and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the views.

Figure l is a plan view of the improvement. Fig. 2 is a sectional sideelevation of the same. Fig. 8 is an enlarged cross-section of the sameon the line 3 3 of Fig. 1. Fig. 4. is an enlarged face view of the gate.Fig. 5 is a transverse section of the same. Fig. 6 is an enlarged sideeleva-tion of the sheer-blocks on the gate and posts. Fig. 7 is afaceview of the sheerblock. Fig. 8 is a perspective view of the same. Fig. 9is an enlarged crosssection of the bottom gate-rail, and Fig. 10 is asectional plan view of the facing-timber on the end of the gate.

The improved dry-dock is provided with a dock-chamber A of suitabledimensions and adapted to be closed or opened at its lowerv the chamberA is connected with a dry-dock D proper, located, however, at a higherlevel than the chamber A, with the top edge in horizontal alinement withthe top edge of the chamber A and gate B when the latter is closed. Nowwhen the gate is open water can pass through the inlet C into thechamber A to iill the latter to within a suitable distance from thebottom of the dry-dock D, as indicated in Fig. 2. The vessel is thenmoved into this chamber A, and then the gate B is closed, after whichwater is pumped into the chamber A by suitable pumping machineryconnected with a suitable water supply. By filling the chamber A to ahigh-water level (indicated in dotted lines in Fig. 2) the doel; D islikewise filled, and the vessel can be floated from the chamber A intothe dock D. The gate B is then opened to permit the surplus water to runout of the doel;` D and chamber A, at the same time permitting vesselsof light draft to pass into the chamber A.

The gate B is preferably constructed as illustrated in detail in Figs. tto 10, the gate being built up of suitable timber, and is iitted toslide into a chamber E, forming an extension on one side of the chamberA, as indicated in Fig. 1. The inner face of the gate B at the endsthereof is lined with vertical strips F, of rubber, adapted to abutagainst corresponding posts of the chamber A to form a water-tightjoint. The bottom rail of the gate B is likewise provided with alongitudinally extending and projecting rubber strip G to form awater-tight joint with the bottom of the chamber A. (See Fig. 9.)

In order to press the strips F and G in position to form the water-tightjoints described, we provide a series of sheer-blocks H, secured on theouter faces of the end beams of the gate B, the said sheer-blocks beingadapted to be pressed in contact with corresponding sheer-blocks H',held on the posts at the gate-opening of the chamber A.

As the contacting faces of the sheer-blocks l-I and H are inclined, asindicated in Fig. 6, the gate B by being pressed downward is also movedinward to cause the strips F and G to form water-tight joints with theircorresponding iixed parts. By this arrangement water is not liable toleak through the gate B when the latter is closed, and hence the chamberA and dock D can be readily filled IOO with water by the pumpingmachinery, as previously described.

The gate is provided with valves in its bottom (not shown) for thepurpose of admitting water to the interior of the gate to force the gatedownward. When the water is removed from the gate by suitable pumpingmachinery, the buoyancy of the gate will keep it aloat or raised abovethe bottom of the charnber A and the gate-chamber E, and the gate canthen be readily moved by any well-known means either into thegate-chamber E or across the lower end of the chamber A. "When the gateis moved into the closed position or across the inlet to the chamber A,the valves in the bottom of the gate are Opened to admit water to theinterior of the gate and the gate will be forced down into position.

Having thus described our invention, we claim as new and desire tosecure by Letters Patentm l. Adry-dock, comprising a dock-chamber, asliding gate at one endof the said chamber and leading to an inlet, adry-dock proper connected with the other end of the said chamber `andlocated at a higher level, packing-strips for forming water-tight jointsbetween Jthe said gate, its posts, and the bottom surface of the saiddock-chamber, and devices carried by the said gate and its posts forcompressingsaid strips when the gate is closed, substantially asdescribed.

2. A dry-dock, comprising a dock-chamber, a transversely-sliding gate atone end of said chamber and leading to anl inlet, a gatechamber formingan extension on one side of the ldock-chamber and into which the gate isiitted to slide, a dry-dock .proper connected with the other end of thesaid dock-chamber and located at a higher level, vertically-disposedpacking-strips on the face of the said gate, a longitudinalpacking-strip on the bottom sill of the gate, and registeringsheerblocks on the gate and guide posts, substantially as shown anddescribed.

3. A dry-dock, comprising a dock-chamber, a gate at one end of the saidchamber and leading to an inlet, a dry-dock proper connected with theother end of the said chamber and located at a higher level, rubberstrips on the inner face of the said gate and disposed vertically, alongitudinal rubber strip on the bottom sill of the gate, to be pressedin contact with the bottom of the chamber A, and registeringsheer-blocks on the gate and guide posts to force the gate downward andinward, to press the said rubber strips in firm contact with the postsand bottom of the chamber, substantially as shown and described. Y

JOHN W. BOGGS. ARCHIBALD CAMERON. Vitnesses:

THAD. S. POTTER, J. A. JOHNSTON.

